The five‑storey T.R. Chandradutt Centre in Thiruvananthapuram uses treated bamboo for half its structure and recycled materials for the rest, creating a carbon‑negative landmark. Local mud‑lime flooring and salvaged doors underline its green credentials.

Key Takeaways

  • Approximately 50% of construction material is treated bamboo
  • All doors, windows and bricks are reclaimed from old structures
  • Floor slabs use locally sourced mud‑lime mix, achieving carbon‑negative status

In the Mannanthala district of Kerala’s capital, a new five‑storey building – the T.R. Chandradutt Centre for Alternative Technology – is redefining low‑cost, eco‑friendly construction. Developed by Costford, a public‑works agency rooted in the vision of former Chief Minister C. Achutha Menon, architect Laurie Baker and economist K.N. Raj, the centre demonstrates how bamboo can replace concrete and brick without compromising strength.

Historical Context

Costford, officially the Centre of Science and Technology for Rural Development, has long championed the “Baker model” – exposed brickwork, natural ventilation and minimal reliance on steel. The foundation stone was laid by Finance Minister T.M. Thomas Isaac in February 2021 as a tribute to social activist Chandradutt, one of Costford’s founders. This latest structure builds on that legacy, aiming to become a living laboratory for sustainable building practices.

Design and Material Strategy

While the skeleton rests on a concrete frame, the walls employ traditional wattle‑and‑daub techniques wrapped in a bamboo envelope. The bamboo, primarily Bambusa bambos, is chemically treated to resist moisture, termites and fire, allowing it to bear significant loads. Treated bamboo accounts for roughly half of the total material weight. The remaining 50% consists of reclaimed bricks, granite, doors and windows salvaged from demolished buildings, as well as floor tiles sourced from scrap.

Construction Details

Floors are laid on bamboo joists and finished with a mud‑and‑lime screed – a technique known locally as “mud screeding.” This creates sturdy, breathable slabs that regulate indoor humidity. The third floor, which houses a spacious parking area, features a concrete screed over the bamboo supports to accommodate vehicle loads. The building also incorporates a sloping Kerala‑style roof and bamboo grills that provide natural shading and ventilation.

Implications for the Future

By demonstrating that bamboo can serve as a structural material comparable to steel or concrete, Costford challenges entrenched industry perceptions. If replicated across public and private projects, such designs could slash construction‑related carbon emissions dramatically. Moreover, the reliance on locally sourced, recycled components reduces transportation costs and stimulates regional craftsmanship.

Costford’s decision to shift from an initially planned steel frame to a more affordable concrete‑bamboo hybrid underscores the economic viability of green construction, especially in a market where steel prices have surged. The centre is slated to host a dormitory, a 100‑seat hall and office spaces, further cementing its role as a hub for research, training and community engagement.